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-   -   RKE Fob storage question (http://www.jeepgarage.org/f73/rke-fob-storage-question-24041.html)

HammFist 06-05-2011 09:34 AM

RKE Fob storage question
 
I do not like carrying the large keyfobs every car seems to have these days in my pocket. So I usually keep the fobs to the cars I'm not driving that day in the glove box of the car I drive daily. In the case of WK2 RKE, this means that when parked in my garage, the fob is only about 4 feet from the Jeep's driver's side door all the time.

Does anyone know if storing the RKE fob within the quoted 5 feet of the door for extended periods of time will run the fob battery down prematurely?

TTUMBIO2010 06-05-2011 12:20 PM

Re: RKE Fob storage question
 
Not if you wrap the key fob in aluminum foil. I've been doing it for years.

scittb 06-05-2011 12:50 PM

Re: RKE Fob storage question
 
Is the FOB itself a receiver too? I woulnt think the FOB itself would know if its 5 ft or 5 miles from the truck. I thought it was just a transmitter.

HammFist 06-05-2011 01:46 PM

Re: RKE Fob storage question
 
Well, the fob has to respond to RF signals from the Jeep, or it wouldn't work. So I guess the questions is, does the WK2 only send out signals to the fob when you put your hand in the door handles (or press the back hatch buttons), or does it ping for a fob continuously?

I suspect it only interrogates when disturbed, and if so, I should be OK -- but wasn't sure.

Dan JGC 06-05-2011 01:47 PM

Re: RKE Fob storage question
 
Yep - the FOB transmits only. Doesn't matter if it is 1" or 1 mile away. Won't affect the FOB battery life just sitting there.

Andrew Klossner 06-05-2011 05:06 PM

Re: RKE Fob storage question
 
Quote:

Originally Posted by HammFist (Post 425499)
Well, the fob has to respond to RF signals from the Jeep, or it wouldn't work.

Yes, but it does so with an RFID chip, like the theft detection chip glued to items at a retail store. It doesn't use the battery; it's powered by the energy of the transmission.

As far as I can tell, the fob only draws on the battery when you press a button. Then it originates a transmission with a much stronger field than RFID. That's why you can remote start from a hundred feet away but must be within five feet for passive entry.

HammFist 06-05-2011 08:59 PM

Re: RKE Fob storage question
 
Quote:

Originally Posted by Andrew Klossner (Post 425582)
Yes, but it does so with an RFID chip, like the theft detection chip glued to items at a retail store. It doesn't use the battery; it's powered by the energy of the transmission.

As far as I can tell, the fob only draws on the battery when you press a button. Then it originates a transmission with a much stronger field than RFID. That's why you can remote start from a hundred feet away but must be within five feet for passive entry.

Thanks for the explanation, and it makes sense from what I've read. So I won't worry about it -- but if anything strange does come up, I'll be sure to post it here.

Dan JGC 06-06-2011 12:00 PM

Re: RKE Fob storage question
 
Quote:

Originally Posted by Andrew Klossner (Post 425582)
Yes, but it does so with an RFID chip, like the theft detection chip glued to items at a retail store. It doesn't use the battery; it's powered by the energy of the transmission.

As far as I can tell, the fob only draws on the battery when you press a button. Then it originates a transmission with a much stronger field than RFID. That's why you can remote start from a hundred feet away but must be within five feet for passive entry.

Yep - that is a correct explanation.


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